BITZER REFRIGERANT RULER vs WOLF Service App
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BITZER REFRIGERANT RULER
This tool quickly determines refrigerant data, including properties, safety groups, GWP, and ODP. It offers intuitive temperature-to-pressure conversion and supports both metric and imperial units. Access detailed information and links to online resources for over 100 refrigerants.
- Refrigerant data lookup
- Temperature-to-pressure conversion
- Metric and imperial unit support
- Over 100 refrigerants
- Oil type information
- GWP and ODP data
- Search filters and favorites
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The BITZER REFRIGERANT RULER enables easy and fast determination of refrigerant data. The app contains all common refrigerants, including key fluid properties, safety group information, global warming potential (GWP), ozone depletion potential (ODP), and information on choice of oil type for the compressor. Furthermore, additional information on refrigerants, links to relevant online documents and other information are displayed (under "More..." in the menu bar). The tool provides an intuitive user interface for easy and accurate temperature-to-pressure conversion, while allowing easy use and switching between different metric (SI) and imperial (IP) units (under "Settings"). // CURRENTLY AVAILABLE REFRIGERANTS // ▸ The app contains data and information on more than 100 natural and synthetic refrigerants, which can also be preselected by filter functions (under "Search"). ▸ For comparison purposes and also for practical use in service and operation of older existing systems, information on previously used refrigerants, which may have been affected by usage restrictions, are also provided. // MAIN FUNCTIONS // ▸ Search filters and favourites: Under the navigation item "Search" or via predetermined "Search filters" or manual entry in the text field the appropriate refrigerant can be found and, if necessary, added to the favourites by tapping the "star symbol". With a simple touch on the selected refrigerant, the slider for the pressure-temperature conversion is displayed. ▸ Ruler: By means of a slider, the values of pressure, dew and boiling (bubble) temperatures (temperature glide resulting from the difference) for the selected refrigerant can be determined. Pressure and temperature values can also be entered manually - either by tapping on the respective field or via the symbol "123". When installing the app overpressure values are preset. With this setting, the atmospheric pressure can be entered either manually on the upper ruler or via the "barometer symbol" to correct the pressure values. A change to absolute pressure values is possible under "Settings", the atmospheric pressure correction is then inactive. Further function: By tapping on the refrigerant name, direct access to "Search" (refrigerant list and search filters) is also possible. ▸ Settings: Under this menu all important parameters for the determination of the atmospheric pressure as well as for temperature and pressure values can be adjusted. Other functions allow for a change to default settings and a repeated display of the “Tutorials” in the ruler view. ▸ Automatic Barometer: The app offers the possibility to determine the current altitude above sea level and/or the actual atmospheric pressure to correct the corresponding dew and bubble temperatures in case of overpressure settings. Depending on the configuration, the analysis for the location in question is optionally carried out automatically via GPS or barometer if the corresponding terminal has the aforementioned sensors. Manually entering the atmospheric pressure or correction is possible as described under “Slider control”. ▸ Temperature / pressure: Temperature and pressure units can be freely selected and combined, if necessary, a mix of SI and IP units is possible as well. For overpressure (or negative pressure) bar (g) or psig / inHg can be selected. In the Setting psig / inHg displays the overpressure values in "psig" and the negative pressure values in "negative inHg" (e.g., -7.5 inHg). ▸ Further information on refrigerants: General and additional information can be found under the information symbol "i" in the header next to the refrigerant name. These include, for example, GWP and ODP values for the refrigerants, safety group, chemical composition or components in mixtures, CAS number, molecular weight, triple and boiling (bubble) points, critical temperature, critical pressure and information on the type of oil for the compressor.
WOLF Service App
This app provides heating technicians with a digital catalog of over 6800 spare parts, complete with photos and exploded views. It also features an error code inspector to quickly diagnose and troubleshoot heating system issues.
- Digital spare parts catalog
- Over 6800 spare parts
- 4600+ associated photos
- 950+ clickable exploded views
- Direct email ordering of parts
- Error code inspector
- Quick troubleshooting manual
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The WOLF Service App is the ideal partner for the heating technician. The app offers a digital spare parts catalog for the heating sector with over 6800 spare parts, more than 4600 associated photos and over 950 clickable exploded views. All selected spare parts can be ordered directly by e-mail from the wholesaler. A special highlight is the error code inspector. After entering an error code and selecting the device type, the problem description and a manual for the quick troubleshooting is shown.
Screenshots
Verdict
The clearest difference is update cadence: WOLF Service App at every 3 weeks against BITZER REFRIGERANT RULER's every 4 months. On price, review sentiment, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
BITZER REFRIGERANT RULER ships an update every 4 months, WOLF Service App every 3 weeks. Both last shipped on September 22, 2026.
| Parameter | BITZER REFRIGERANT RULER | WOLF Service App |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (1.1K ratings) — better | — |
| Positive reviews | 63.6% of reviews | 65.0% of reviews — better |
| Number of ratings | 1.1K — better | — |
| Update frequency | Every 4 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 21 MB | 206 MB |
| Age rating | 4+ | 4+ |
| Developer | BITZER SE | Wolf GmbH / www.wolf.eu |
Customer experience
BITZER REFRIGERANT RULER
WOLF Service App
Bugs and requests
BITZER REFRIGERANT RULER
Reported bugs
2 issues- Incorrect pressure-temperature relationships
- Inconsistent units (PSIA vs PSIG)
Requested features
3 requests- Altitude adjustment option
- Ability to filter or hide unwanted refrigerants
- Addition of more refrigerant trade names
WOLF Service App
Not enough reviews yet to summarise bugs or requests.
In-app purchases
BITZER REFRIGERANT RULER
No in-app purchases
WOLF Service App
No in-app purchases
Questions
Is BITZER REFRIGERANT RULER free?
Is WOLF Service App free?
Do BITZER REFRIGERANT RULER or WOLF Service App have ads?
Which is updated more often, BITZER REFRIGERANT RULER or WOLF Service App?
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